> is easy to obtain legitimately.
Depends on the country. In Europe, it's not so easy. In the UK, the last I checked, it was contraindicated for long-term use, meaning it could be used for smoking cessation but not for long-term ADHD treatment.
> similar to amphetamines
Wellbutrin has a very different mechanism of action, and a different effectiveness profile. I wouldn't say it's "similar to amphetamines" in any clinical sense.